recently I got myself the Inons-Z240, after one of my sea&sea's finaly died after for a long lifetime. Inon supply's both -0,5 and -1,5 diffusors for the strobe. Are there situations that someone would prefer the -1,5 over the -0,5? I havent been able to get the Inons wet yet, it seems logical to me to attach the -0,5 in order to maintain most of its power. Is there someone who can tell a little more about these 2 diffusors? Specialy when or why he/she prefers the -1,5?